Dumbledore would probably be very calm and have a long - term plan. He might use this as an opportunity to teach Harry something new or guide him in a different direction. Some of the teachers at Hogwarts might be worried about how this will affect Harry's performance in class and his safety at school.
The village elders might see Naruto's memory loss as a threat to the village if they think it affects his ability to protect it. They could try to keep an eye on Naruto and the male character he is involved with in the Yaoi relationship. This could create tension as the two just want to figure out Naruto's situation and develop their relationship, but now they have to deal with the watchful eyes of the elders.
Sasuke might try to stop Naruto. Given their complex relationship, Sasuke would likely feel a sense of responsibility. He could use his own powers to try and subdue Naruto and bring him back to his senses.
Ron might laugh out loud at first. He has a good sense of humor and would find the whole situation hilarious. But then he would also be a bit worried about Harry's dignity. Ginny, on the other hand, would probably blush and giggle. She has a bit of a crush on Harry and seeing him in such an adorable yet silly state would be both endearing and embarrassing for her.
Hermione would likely be devastated. She might go into a deep state of mourning, but also use her intelligence to try and figure out what led to Harry's death. Ron would be angry and heartbroken at the same time. He'd probably want to seek revenge if there was someone or something responsible.
The Weasley family would also be greatly affected. Mrs. Weasley would surely mourn Harry as one of her own. Ginny, who had feelings for Harry, would be heartbroken. She might become more fierce in her pursuit of justice in the wizarding world. And the other students at Hogwarts, like Neville, would be inspired by Harry's sacrifice to step up and be braver in the face of danger.
Hermione would probably be very angry. She is a strong advocate for fairness and the right way of doing things. So, she would likely confront Ginny about using such an unethical method on Harry.
His relationships would be turned upside down. His friends would be heartbroken and might have to re - introduce themselves to him. Some might become overprotective, while others could be distant, not knowing how to handle this new Percy.
At first, Tony would be in shock. But then, he'd start trying to jog her memory in his own way. He'd show her all their personal mementos, like the first rose he gave her or the necklace he designed for her. He'd also tell her stories about their adventures together, hoping that something would click. And he'd be very protective of her, not wanting any harm to come to her in her vulnerable state.
Hermione would probably be shocked at first but then be very supportive. She's always been open - minded and would see the potential for good in their union. Ron, on the other hand, might be more hesitant and take some time to come around. He has his prejudices against the Malfoys. Professor McGonagall might be a bit taken aback but would likely uphold the legality of their marriage and ensure they are treated fairly in the wizarding community.
The teachers would likely be very cautious. Professor McGonagall might be extremely strict and keep a close eye on Pettigrew. She would be worried about the safety of the students. Ron would probably be very angry at Harry at first. He has a strong hatred for Pettigrew because of what he did to his family. Hermione, on the other hand, would be more rational. She would try to analyze the situation and see if there is any benefit to Pettigrew being back at school.